Overview
Onondaga was the sole member of her double-turret monitor class.
USS Onondaga is associated with United States and United States Navy. It belonged to Onondaga class, so the class page provides the shared design history while this page concentrates on the individual ship.
Construction and identity
The available construction record identifies USS Onondaga as built by Continental Iron Works, Greenpoint, New York.
The ship's documented identity includes service with United States Navy.
Service history
She operated mainly in the James River Flotilla, supporting Union operations against Richmond and engaging Confederate batteries.
The ship's configuration should be interpreted through the documented class and the dates attached to this individual vessel; equipment should not be assumed to have remained unchanged throughout service.
Class context: Onondaga class
Onondaga was a one-ship double-turret monitor built for the U.S. Navy during the Civil War. Her mixed battery paired 15-inch Dahlgren smoothbores with 150-pounder Parrott rifles.
As a member of Onondaga class, USS Onondaga shared the class's documented design framework and intended roles of Riverine combatant and Shore bombardment. Individual refits, transfers, and wartime changes belong to this ship only when separately documented.
Later service and disposition
Sold after U.S. service and ultimately entered French service.
USS Onondaga matters as an individual career within Onondaga class, allowing class-wide design history to be separated from this ship's own construction, identities, service, and fate.
Class relationship
This ship is recorded as a member of Onondaga class. Shared design history belongs on the class page; this page concentrates on the individual hull where evidence is available.
Sources and further reading
- Onondaga I (Monitor) ↗Naval History and Heritage Command · accessed 2026-09-18